Infected PCs have never been allowed in Missions, AFAIK. There's a fair amount of stuff about vampires that make them ill-suited to organized play (or organized play ill-suited to them).
That being said, one can do some "reskinning" of a lot of existing powers to roleplay being a vampire while retaining the normal game balance: Adept powers like Improved Physical Attribute, Improved Reflexes, and Attribute Boost can make you strong and fast. A lot of spells can be used to mimic vampiric powers (Healing for Regeneration, Increase Attribute or Reflexes, Mental Manipulation spells, etc.). You can still take an Allergy to sunlight. Just take some of those powers and use the flavor that he's a vampire.